13

LTC1334

Figure 18. Typical Cable Extension for RS232/EIA562 Interface

S

APPLICATI

I FOR ATIO

RS422

RS232/EIA562

LTC1334 • F18

100

Ω

100

Ω

13

11

9

19

24

23

22

17

8

DR OUT

RX IN

5V

4

5

6

7

LTC1334

RS232/EIA562

22

11

13

17

5V

9

19

24

23

8

4

5

6

7

RX IN

DR OUT

LTC1334

RS422

RS232/EIA562

LTC1334 • F17

100

Ω

13

11

9

19

24

23

22

17

8

TX OUT

TX OUT

RX IN

RX IN

5V

4

5

6

7

LTC1334

Figure 17. Typical RS232/EIA562 to RS422 Level Translator

Figure 16. Typical Cable Repeater for RS422 Interface

1/2 LTC1334

TX OUT

RX IN

LTC1334 • F16

100

Ω

4

5

6

8

23

22

24

7

5V

1/2 LTC1334

1/2 LTC1334

1/2 LTC1334

LTC1334 • F15

100

Ω

22

23

8

24

8

17

18

19

5V

5V

RX OUT

RX OUT

RX OUT

DR ENABLE

DR ENABLE

DR IN

DR IN

5 4

8

5V

4

5

6

7

11

10

13

24

12

100

Ω

Figure 15. Typical Connection for RS422 Interface

A typical RS422 connection (Figure 15) allows one driver

and ten receivers on a twisted pair of wires terminated with

a 100

Ω resistor at one end.

A typical twisted-pair line repeater is shown in Figure 16.

As data transmission rate drops with increased cable

length, repeaters can be inserted to improve transmission

rate or to transmit beyond the RS422 4000-foot limit.

The LTC1334 can be used to translate RS232 to RS422

interface levels or vice versa as shown in Figure 17. One

port is configured as an RS232 transceiver and the other

as an RS485 transceiver.

Using two LTC1334s as level translators, the RS232/

EIA562 interface distance can be extended to 4000 feet

with twisted-pair wires (Figure 18).

AppleTalk

Two AppleTalk applications are shown in Figure 19 and 20

with the LTC1323 and the LTC1334.

AppleTalk and LocalTalk are registered trademarks of Apple Computer, Inc.